Adaptation Properties of Macaque MT Neurons Adam Kohn Matt A. Smith Najib Majaj J. Anthony Movshon

Questions Change in direction tuning –Direction specificity Transfer of adaptation in RF –Spatial specificity

Dragoi et al. (2000) Specificity of V1 Adaptation Effects Spatial Frequency -Movshon and Lennie (1978) -Saul and Cynader (1989) Temporal Frequency - Saul and Cynader (1989) Orientation -Muller et al. (1999) -Dragoi et al. (2000)

Test Adapt

Preferred Flank Null

Response=R max c n /(c n +c 50 n )+base Test Adapt Test

Proportion of Cells Ratio of Contrast Sensitivities Different Patch Same Patch

Ratio of Contrast Sensitivities Proportion of Cells Different Patch Same Patch

Conclusions Adaptation in MT causes a change in contrast gain transfers across directions within the tuning curve does not transfer across positions within the RF